GRAMINEAE. 31 



2. EEIANTHUS Michx. Plumb-grass. 



Awn spiral. 1. E. alopecuroides. 



Awn straight. 2. E. compactus. 



1. Erianthus alopecuroides (L.) Ell. M. p. 67. Damp soil. Autumn. 



Bwlington— Below Burlington > (C.) . Gloucester— Mickleton, Swedes- 

 •■■ boro (C.)» Atlantic — Hammonton (C). 



2. Erianthus compactus Nash. M. p. 68. Moist soil. Summer. 



Bucks— Andalusia, Mart. (Fr.). 



3. ANDBOPOGON L. Beard-grass. 



Eacemes singly disposed; apex of the rachilla internodes with' a translucent, 

 cup-shalped, entire or irregularly-toothed appendage. 

 Spikelets 5-7 mm. long; sheaths of the innovations green. 



' 1. A. scoparius. 



Spikelets 8-10 mm. long; sheaths of the innovations strongly com- 

 pressed, glaucous. 2. A. Uttoralis. 

 Eacemes disposed in pairs or more; apex of the rachis internodes unappen- 

 daged. 

 Pedicellate spikelet sterile, of 1 or 2 scales, much smaller than the ses- 

 sile one. ' ■ 

 Eacemes usually protruding from the lateral fissure of the spathe, 

 gometimes more or less exserted from the apex, the peduncle, 

 never long exserted. 

 Branches of ^ the inflorescence crowded at the summit of the 

 culm in a dense corymbiform panicle. 3. A. aor.ymbosus. 

 Branches of the, inflorescenQe scattered along the culm in a 

 long, linear panicle. 4. A. Vyrginicus. 

 Eacemes much exserted on long peduncles. 5. A. drgyraeus. 

 Pedicellate spikelet as large as, or. larger than, the sessile, pf 4 scales and 

 a staminate or rarely perfect flower. ' , t .6. A. f meatus. 



1. Andropogon. scoparius Michx. M. p. 69. Dry ground. Late summer. 



2. Andropogon littoralis Nash. M, p. 69. In sand along the seashoTei 



Summer. 

 Cape May — Stone Harbor (St.). 



3. Andropogon corymbosus (Chapm.) Nash. M. p. 69. Wet soil. Autumn. 



Bucks — Bristol (Fr.). Montgomery — /(P.). Delaware — Valley of 

 Darby Creek (B. Sin.), Concord (W. Ti\). Chester— (P.). Lancaster— 



(p.). ,Jra^*i m>j £h t . qnjt4r£rt* j r*^ 



New Jersey— Common. «->_ ■— — 



New Castle— Frequent. 



4. Andropogon Virginicus L. M. p. 70. Dry or moist fields. Late sum- 



mer. 



5. Andropogon argyraeus Schultes. M. p. 70: Dry sandy soil. Autumn. 



New Castle— Eailroad below Townsend. 



6. Andropogon furcatus Muhl. M. p. 70. Dry or moist soil. Late sum- 



mer. 



4. SOEGHUM Pers. 



1. Sorghum Halepense (L.) Pers. Johnson-grass. M. p. 71. Fields and 

 waste places. Summer. 

 Philadelphia— (P.) . Bucks— (P.) . 



